The trick for me to get used to Office 2007/2010, was to forget where things used to be, and search them where they are supposed to be. Then everything clicked into place, and now I like the UI quite a lot.
Note that I don't mean the SAME UI works for everything. That's a mistake some people seem to make. Different kinds of software are best with different interfaces.
That may be an option. I will have to test it before I give up on Firefox completely, although I fear an add-on that changes so much may break things in the long run.
I did test it some months ago, when I first discovered Australis. Back then it lacked many details that made me prefer to downgrade to a more stable channel, but I will try it before I completely dismiss Firefox. If it even really happens, because as much as I dislike getting things shoved down my throat, the alternatives feel even worse. In them, there's no customization at all.
I don't know why people take my comment so badly. I dislike Australis, not Firefox.
I have been using nightly builds of Firefox for years, with some short breaks when an unwanted change was being introduced. Sometimes the change was discarded, other times I decided to embrace it. I got used to the new downloads panel, for example.
Up until now, I have been able to revert all the changes they made, where I didn't want them. A big example of this is they keyhole back/forward button. I keep the Home button in between back/forward and the addressbar, so that they don't merge. In contrast, I did like the stop/refresh being combined, and I was ok with them being put into the addressbar. I use F5 to refresh anyhow.
But above all, I value customization. That's why I use Firefox, and why I choose to use it instead of Chrome or IE11. I like to see things the way I want them, and they don't usually match the designer's choice. As I said, up until now, the changes were either positive, or they did not affect me enough to reject them. Australis is something else.
With Australis, they are removing customization, in favor of a more unified UI across all devices. This has two issues, in my eyes, which are both based on one simple fact: I have a very large monitor, at 2560x1440px. And it could still be bigger. I have enough space in my screen to hold a webpage, multiple addressbars, and in those, keep all the buttons I would ever use.
I don't want an UI optimized to reduce space. I don't want an UI that looks the same in my desktop and my tablet -- they are very different devices with very different purposes. I want to put things where I like them. And they are taking that away from me.
By my principle, I want to use the closest thing I can get to the Firefox I Used To Love. So yes, PaleMoon is my top alternative so far. And don't you dare talk about chickening while posting as AC.